/*
 * jPOS Project [http://jpos.org]
 * Copyright (C) 2000-2015 Alejandro P. Revilla
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.jpos.iso;


/**
 * Implements ASCII Interpreter. Strings are converted to and from ASCII bytes.
 * This uses the US-ASCII encoding which all JVMs must support.
 *
 * @author joconnor
 * @version $Revision$ $Date$
 */
public class AsciiInterpreter implements Interpreter {
	/**
	 * An instance of this Interpreter. Only one needed for the whole system
	 */
	public static final AsciiInterpreter INSTANCE = new AsciiInterpreter();

	/**
	 * (non-Javadoc)
	 */
	@Override
	public void interpret(String data, byte[] b, int offset) {
		System.arraycopy(data.getBytes(ISOUtil.CHARSET), 0, b, offset, data.getBytes(ISOUtil.CHARSET).length);
	}

	/**
	 * (non-Javadoc)
	 */
	@Override
	public String uninterpret(byte[] rawData, int offset, int length) {
		byte[] ret = new byte[length];
		try {
			System.arraycopy(rawData, offset, ret, 0, length);
			return new String(ret, ISOUtil.CHARSET);
		} catch (IndexOutOfBoundsException e) {
			throw new RuntimeException(
					String.format("Required %d but just got %d bytes", length, rawData.length - offset)
			);
		}
	}

	/**
	 * (non-Javadoc)
	 */
	@Override
	public int getPackedLength(int nDataUnits) {
		return nDataUnits;
	}
}
